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PDF M54676 Data sheet ( Hoja de datos )

Número de pieza M54676
Descripción 2-PHASE STEPPER MOTOR DRIVER
Fabricantes Mitsubishi 
Logotipo Mitsubishi Logotipo



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MITSUBISHI <CONTROL / DRIVER IC>
M54676P
2-PHASE STEPPER MOTOR DRIVER
DESCRIPTION
The M54676P is a semiconductor IC to drive a bipolar stepper
motor by the micro step method by changing the coil current of the
motor continuously.
FEATURES
qHighly-accurate micro step drive by chopping sink output
transistor and source output transistor simultaneously
qBipolar and constant current drive
qBuilt in a thermal shutdown circuit and standby circuits
qBuilt in flywheel diodes
APPLICATION
Office automation equipment such as printer and FAX
FUNCTION
The M54676P can drive a stepper motor by the 2-phase bipolar
method and also controls the coil current.
Furthermore, it controls the direction of the coil current by Ph input
and the coil current value by Vref pin.
Because two control circuits are built in this IC, a stepper motor
can be driven with a single IC by the 2-phase bipolar method.
PIN CONFIGURATION (TOP VIEW)
OutA 1
Out A 2
SG A 3
Sense A 4
GND 5
GND 6
Vref A 7
Phase A 8
Phase A 9
Vcc5 10
20 VM
19 OutB
18 Out B
17 SG B
16 GND
15 GND
14 Sense B
13 VrefB
12 PhaseB
11 Phase B
Outline 20P4
BLOCK DIAGRAM
13 7
Vref A Amp Vref 2 comparator
--
9K0.2V
-
1KCurrent
comparator
20
Vcc5 10
20K
6K
Vref B Amp
Vref 2
comparator
-
-
9K0.2V
1K
-
Current
comparator
Internal TSD
bias
4 14
8 9 11 12 16 15 6 5
GND
12
17
3 SGA
19 OUT B
18 OUT B

1 page




M54676 pdf
MITSUBISHI <CONTROL / DRIVER IC>
M54676P
2-PHASE STEPPER MOTOR DRIVER
PRECAUTIONS FOR USE
Sequence of supply voltage (VM and Vcc5) and logic
input voltage
The VM voltage should be the maximum voltage among all volt-
ages applied to this IC. If no voltage is applied to VM and 5V
voltage is applied to Vcc5 pin and logic input pin, leak current flows
from Vcc5 pin and logic input pin to VM through a surge protection
diode.
Wiring on the board
Current is controlled by flowing output current to the current
sensing resistor (1 ohmlevel) to measure the voltage fall.
The output current performs the chopping operation at high speed.
Therefore, wiring to flow current and to connect the high-
impedance input pin (Vref) should be conducted carefully not to
cause a cross talk.
VM
12V
12V
0V
(Open)
Vcc5
5V
0V
(Open)
5V
Logic
input
Mode
5V,0V Normal operation mode
5V,0V
Standby mode (No current flows to
logic input pin and Vcc pin.)
5V,0V
Leak current flows
from Vcc5 pin and
logic input pin to
Prohibited
VM pin.
Sequence
After the VM voltage rises, set the Vcc5 power supply voltage and
logic input voltage. Similarly, after Vcc5 supply voltage and logic
input voltage rise, raise the VM supply voltage.
Time
VM
Vcc5
and
logic input
Thermal shutdown function
The circuit board on which this IC is mounted is designed to realize
low impedance between power supply and output pin. Therefore, it
is desirable to take a safe measure such as fixing a fuse to avoid
such a situation that the board is damaged by a fire when output
pin is internally short-circuited by excessive surge voltage applied
externally by accident (or when the TSD function is damaged).
Thermal loss
In case that conditions for use (regarding supply voltage and
output current) or a board used is changed, sufficient thermal
evaluation should be conducted and design should be worked out
to leave a margin for thermal loss. The higher the chopping
frequency is, the larger switching loss within the IC becomes.

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